relative atomic mass — An Etymological Dictionary of Astronomy and Astrophysics

relative atomic mass

جرم ِ اتمی ِ بازانی

jerm-e atomi-ye bâzâni

Fr.: masse atomique relative

The ratio of the mass of an atom of the → chemical element to one-twelfth the mass of an atom of carbon-12. Because an element in nature is usually a mixture of isotopes, the relative atomic mass is also the weighted mean of the atomic masses of all the atoms in a particular sample of the element, weighted by isotopic abundance. In this sense, relative atomic mass was once known as → atomic weight.

See also: → relative; → atomic; → mass.

An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک